kbuild: avoid re-running compiler and linker probes

Each kernel make invocation begins with ~30 compiler and linker runs each
of which performs duplicate probe for a number of compiler and linker
options.

This is useless work - the compiler and its version is known, so use these
to determine which options are available, once.

Using the newly introduced cc-option-str, track the result of each probe in
CC_OPT_*, LD_OPT_* variables and have Makefile's simply append the symbol.

Some care has to be taken around negative options, i.e. -Wno-xxx, as gcc
accepts an unknown -Wno- without complaint and only complains later, so
instead probe the positive form for these cases.

Use CC_HAS_* For those probes that gate a Makefile conditional rather than
a simple option, as per the established pattern for this.

This change avoids a subtle issue with ppc32 (big endian) - clang doesn't
accept -fno-stack-clash-protection on this sub-target, so keep this option
in the Makefile.

With gcc and clang, defconfig and allmodconfig, the recorded command
lines are unchanged, a build with nothing to do rebuilds nothing and W=1
continues to function correctly.

Doing this improves all builds, but has a particularly positive impact on
no-op builds (builds where nothing has changed).

Whole build, 128-thread Threadripper 9980X, best of N runs:

                                         before   after     delta
                                         -------------------------------
  x86 defconfig, no-op make, gcc           0.78s    0.60s    -0.18s (-23%)
  x86 defconfig, no-op make, clang         0.94s    0.66s    -0.28s (-30%)
  x86 defconfig, touch mm/vma.c, gcc        8.6s     8.5s    -0.16s (-2%)
  x86 defconfig, touch mm/vma.c, clang      8.0s     7.7s    -0.24s (-3%)
  x86 defconfig, clean, clang              29.8s    29.4s    -0.37s (-1%)
  x86 allmodconfig, no-op make, gcc        12.9s    12.7s    -0.23s (-2%)
  x86 allmodconfig, no-op make, clang      14.2s    13.9s    -0.29s (-2%)
  x86 allmodconfig, touch mm/vma.c, clang  32.2s    31.9s    -0.30s (-1%)

Assisted-by: LLM
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Link: https://patch.msgid.link/20260923-build-speedup-v4-12-73128809a4a4@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

0 files changed, 0 insertions, 0 deletions